https://www.wickes.co.uk/Wickes-13mm...900mm/p/187723
I found this on sale, 13mm I think that should be okay? I've been looking around all day lol
13mm is roughly 1/2" which I think is an accepted size, I think I'm gonna go with this one? I'll wait a couple of hours for some responses but this seems to be my best option and I've been looking around for the past couple of days